Telle mere telle fille

Housemate's Angel of Death mother has now been replaced by her equally neurotic sister. This woman makes Howard Hughes look like a slob. The other day I put a new bag in the bin and The Sister actually sneaked back into the kitchen when she thought I wasn't looking so that she could rearrange it. This isn't normal behaviour.

Advice please. How does one dispose of unwanted house guests? Not in a Shallow Grave sort of way, you understand, things have not become that unbearable yet. It happened several weeks ago when my housemate went on holiday for three weeks. She told her parents that they were welcome to use her room in the flat. Unfortunately she did not tell me (or indeed ask if I would mind, which would have been a better courtesy). So for three weeks they popped into the flat unannounced, held dinner parties, left low-brow newspapers around the flat, that sort of thing.

Now aforementioned flatmate's mother has popped back up to London for some unfathomable reason and as I write she is sitting on our sofa eating bran flakes. The flat is tiny, as is my patience. What shall I do?!